The game Stet!, a spinoff of the book “Dreyer’s English,” is an excellent way to prepare for a copy-editing test and pairs well with a gin-and-tonic. Mary Norris, writing for The New Yorker: Nerdsday fell on a Tuesday this year, and I invited a friend over for a doubleheader: a round of Stet!, the new language game based on “Dreyer’s English,”…